铜及铜合金压延时下模及压边圈工作表面应保持（）。
A、润滑良好
B、一定温度
C、平整润滑
D、光洁
参考答案：D
现代人类错胎约占
A．35%
B．48.9%
C．50%
D．70%
E．45%
She appealed to the judge to _____ her husband. [ ]
A. put mercy to
B. get mercy with
C. have mercy on
D. be at mercy of
